So, as I understand the concept, it's not about removing the LSB completely. They still remain in use for intubated patients, combative patients, and those you can't communicate with. The idea, is that conscious, cooperative people will splint their own necks. Further, the application of a traditional LSB/blocks/collar restriction carries some real risks for the patient, with little or no proven benefit.
* It takes relatively little time on an LSB to cause pressure ulceration. Most trauma patients are already at increased risk.
* Traditional spinal restriction results in a 20% decrease in FRC, which could become a trigger for pre-hospital RSI.
* Spinal immobilisation can complicate airway management, and increases ICP.
* The LSB is a relatively poor device for spinal "immobiilisation", as you're trying to force a curved structure to conform to a rigid plane.
* Healthy volunteers often develop neck pain, and report moderate-to-severe pain when immobilised on an LSB, which can result in unnecessary imaging, which carries costs and risks to the patient.
I think the rolls/blocks are primarily there to remind the patient not to move their head. Which is pretty much what they do on an LSB, anyway. I think we're all aware that a patient can generate substantial joint motion while immobilised.
There's also the question as to how great the benefit really is with traditional techniques. Only a very small percentage of patients that are immobilised by EMS have c-spine fractures. The vast majority of these are stable fractures. Even most of the radiographicaly "unstable" fractures are not grossly unstable, as in the patient will move their head and displace their c-spine. They're unstable in the sense that it would be unwise to discharge them home, to play soccer or football without addressing the injury. Even when injury does occur in a patient that presents neurologically intact, it's difficult to know whether this is from motion during their care or the natural progression of the initial insult, e.g. cord contusion/concussion. There's a certain argument that the force required to fracture the c-spine is many magnitudes of order greater than any force the patient may apply through voluntary movement of their neck.
Also, consider the care provided in the ER, where often the patient is removed from the LSB prior to radiography, and left supine with instruction not to move their head. Even after an injury is identified, it's not like the patient is immediately put back on an LSB and then halo'd. They're basically put on a soft stretcher, and told not to move their head, and log rolled by staff. That's all this really Is. It may be a change in care for EMS, but it's not really a divergence from standard care in the ER.
The patients that are combative are still on the LSB --- and these are the patients the ER typically leaves on, right? Because we're using it as a restraint device as much as anything else. The patients that are intubated are still on the LSB -- they can't splint, and tube displacement is a potential disaster. The patients that are significantly altered, or who can't follow instructions due to a cognitive issue or language barrier, they're still on the LSB too. But what's happening, is there's a recognition of the limitations of the LSB, and that "immobilisation", is a fantasy -- what we're doing is restricted motion. This can be accomplished in a number of different ways, which can be tailored to the patient.